Mitsubishi MMT16IRA60-S VP15TF Internal Threading Insert
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MMT16IRA60-S VP15TF
Mitsubishi Materials | Internal Partial Profile 60° (Metric / UN / UNC / UNF)
The Mitsubishi MMT16IRA60-S VP15TF is a versatile internal threading insert designed for 60-degree profiles. As a partial profile A-type insert, it provides the flexibility to machine various pitches ranging from 0.5mm to 1.5mm (48 to 16 TPI) with a single tool. This makes it an essential component for CNC threading of internal Metric and Unified National (UN) threads. Featuring the -S type 3D molded chipbreaker and the proprietary VP15TF Miracle PVD coating, it is engineered for precision and longevity when threading stainless steel, carbon steels, and alloyed materials.
Technical Specifications
| ISO/Metric Designation | MMT16IRA60-S |
|---|---|
| Thread Profile | 60° Partial Profile (Internal) |
| Pitch Range | 0.5 - 1.5 mm / 48 - 16 TPI |
| Insert Size (IC) | 9.525 mm (3/8") |
| Grade / Coating | VP15TF (Miracle Al-Ti-N PVD) |
VP15TF Miracle Grade
The VP15TF grade is the industry benchmark for indexable threading. It combines a tough carbide substrate with Mitsubishi's Miracle (Al-Ti-N) PVD coating. This provides exceptional resistance to built-up edge (BUE) and plastic deformation, ensuring stable tool life even when machining stainless steel (SUS304/316) and other gummy materials.
-S Type 3D Chipbreaker
Internal threading is notoriously difficult for chip evacuation. The -S molded chipbreaker utilizes a specialized 3D rake geometry to curl chips into tight, manageable spirals. This allows coolant to easily flush chips out of the bore, preventing "chip nesting" and protecting the thread surface finish from scratches and recutting.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Typical No. of Passes |
|---|---|---|
| Carbon Steel (S45C) | 90 - 160 m/min | 6 - 12 |
| Stainless Steel (304/316) | 70 - 130 m/min | 8 - 14 |
| Alloy Steel (SCM440) | 80 - 140 m/min | 7 - 13 |
MMTIR INTERNAL TOOLING SYSTEM
This 16IR insert is optimized for use with Mitsubishi MMTIR internal boring bars and all standard 16mm (3/8" IC) internal threading holders.
Shop MMTIR Internal Bars →Metric vs. Inch Cross-Reference
| Feature | Metric Designation | Inch Designation (ANSI) |
|---|---|---|
| Insert Size | 16 IR | 16IR (3/8" Inscribed Circle) |
| Max Pitch Range | 1.5 mm | 16 TPI |